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Evidence for an electrogenic and a non-electrogenic component in the slow phase of the P515 response in chloroplasts

✍ Scribed by J. J. J. Ooms; W. J. Vredenberg; W. F. Buurmeijer

Publisher: Springer
Year: 1989
Tongue: English
Weight: 473 KB
Volume: 20
Category: Article
ISSN: 0166-8595
DOI: 10.1007/bf00034121

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✦ Synopsis

The flash-induced P515 absorbance change in intact chloroplasts consists of a fast and a slow phase. There is disagreement in the literature over the origin of the slow phase.

Here we argue that the flash-induced slow phase in P515 absorbance change is composed of two different components. One component is most probably due to the electrogenic Q-cycle associated with the cytochrome b/f complex. The second component has decay kinetics that are much slower than the electrogenic reactions. We suggest that the second component is due to a non-electrogenic reaction.

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